Where Seldom is Heard A Discouraging Word

So, Greg wants to pose as an old West shootist.
Alas, one should be careful what one wishes for, because his choice of words mimics the wording of Othello in Shakespeare's play:

When you shall these unlucky deeds relate,
Speak of me as I am; nothing extenuate,
Nor set down aught in malice. Then must you speak
Of one that lov'd not wisely but too well;

It seems that Greg has loved his western fiction, his idealized gunslinger image, not wisely but too well.
Greg uses the word shootist, without correctly understanding either its origin or its meaning.
The OED - for those of you unused to the slang, that is the Oxford English Dictionary, unabridged in this case, educates us on the word shootist:

shootist, n.
Pronunciation: /ˈʃuːtɪst/
Etymology: < SHOOT v. + -IST suffix.
slang.
One who shoots game, or who competes in a shooting-match; one skilled
in shooting. Chiefly jocular or disparaging.
1864 Gold Hill (Nevada) News 15 Jan. 3/1 (heading) A Shootist.
1872 M. SCHELE DE VERE Americanisms 657 The man whose rifle brought down the largest amount of
game became known as a famous shootist.
1899 F. V. KIRBY Sport E. Central Afr. iv. 47 Unfortunately it would not be the shootist and his party who
would suffer.
1976 National Observer (U.S.) 4 Sept. 18/2 J. B. Books, the protagonist of Wayne's new movie, The
Shootist,..not only restores the legend but expands it, giving the man and his memory grace and
dignity. A shootist is a man good with a gun, and J. B. Books is a retired marshal who was good
enough to kill 30 men.
shootist, n.
Second edition, 1989; online version September 2011. <http://photo.pds.org:5004/view/Entry/178513>; accessed
08 December 2011. Earlier version first published in New English Dictionary, 1914.
Oxford University Press

Since Greg is clearly not competing in target shooting and not in hunting shooting either, we can only assume that he wishes, posing as a 'shootist' for us to disparage him for doing so.  Greg wants to emulate the Hollywood fiction, not the historic fact --- and we are right to tease him for doing so.  His concept is pure fiction, classic Hollywood hype, and not factual history.